The Sex-Role Egalitarianism Scale (SRES) was developed to measure attitudes toward the equality of women and men across content domains representing marital, parental, employment, social-interpersonal-heterosexual, and educational roles. The instrument exists in four versions: two alternate 95-item full forms and two alternate 25-item abbreviated forms. Reliability indices derived from a classical test-theory approach, multifaceted generalizability procedures, and an item-response theory-based analysis all support consistency or precision of measurement. Evidence for convergent, discriminant, and nomological validity is presented, along with a series of recommendations for future psychometric and substantive research using the scale.